Found out that my GSP didn't like it either, and neither did my colt coral. Moved the colt and the anthelia after the first treatment, and will move my GSP before my second treatment. Also lost one cleaner shrimp, but, the other is doing well, so, it's hard to say if it's panacur related, or just old age, (this guy was about 3.5" long... and been that size for about a year... Not knowing the lifespan of them, it's a tough call).
For those keeping track, so far it's:
Anthelia
Xenia
Green Star Polyps
Colt Coral
that don't like Panacur, (and quite possibly cleaner shrimp
). I'll let you know if anything else in my tank has any ill effects from the treatment, (will be doing the second round tonight).
So, are all of the hydroids dead yet?
Robert